Channel state indication method and apparatus, and network device

Abstract

A method includes: obtaining, by a first network device, channel state information; generating, by the first network device, channel state indication information, where the channel state indication information includes an absolute value of the channel state information or an offset value of the channel state information relative to reference channel state information; and sending, by the first network device, the channel state indication information to a second network device.

What is claimed is: 
     
       1. A method, comprising:
 receiving, by a first network device, physical layer signaling sent by a second network device, wherein the physical layer signaling indicates a first state or a second state, and wherein the physical layer signaling includes feedback time information; 
 obtaining, by the first network device, channel state information; 
 generating, by the first network device, channel state indication information by:
 in response to the physical layer signaling indicating the first state, generating the channel state indication information comprising an absolute value of the channel state information; and 
 in response to the physical layer signaling indicating the second state, generating the channel state indication information comprising an offset value of the channel state information relative to reference channel state information, wherein the reference channel state information is notified by the second network device to the first network device; 
 
 determining, by the first network device, a transmission time based on the feedback time information; and 
 sending, by the first network device, the channel state indication information to the second network device at the transmission time. 
 
     
     
       2. The method according to  claim 1 , wherein the channel state information comprises:
 channel quality indicator (CQI) information. 
 
     
     
       3. The method according to  claim 1 , wherein the channel state information comprises:
 modulation and coding scheme (MCS) information. 
 
     
     
       4. The method according to  claim 1 , wherein the channel state information comprises:
 block error rate (BLER) information. 
 
     
     
       5. The method according to  claim 1 , wherein the channel state information comprises:
 power information. 
 
     
     
       6. A method, comprising:
 sending, by a second network device, physical layer signaling to a first network device, wherein the physical layer signaling includes feedback time information indicating a transmission time; 
 receiving, by the second network device, channel state indication information that is sent by the first network device at the transmission time, wherein the channel state indication information indicates channel state information, and wherein:
 when a time between a previous moment in which previous channel state indication information is sent and the transmission time exceeds a preset time threshold, the channel state indication information comprises an absolute value of the channel state information; and 
 when the time between the previous moment in which the previous channel state indication information is sent and the transmission time does not exceed the preset time threshold, the channel state indication information comprises an offset value of the channel state information relative to reference channel state information, wherein the reference channel state information is notified by the second network device to the first network device; and 
 
 obtaining, by the second network device, the channel state information. 
 
     
     
       7. The method according to  claim 6 , wherein a length of the preset time threshold is notified by the second network device to the first network device. 
     
     
       8. The method according to  claim 6 , wherein the channel state information comprises:
 channel quality indicator (CQI) information; 
 modulation and coding scheme (MCS) information; 
 block error rate (BLER) information; or 
 power information. 
 
     
     
       9. The method according to  claim 6 , wherein a length of the preset time threshold is preconfigured. 
     
     
       10. An apparatus, comprising:
 a transceiver; 
 at least one processor; 
 a non-transitory computer-readable storage medium storing a program to be executed by the at least one processor, the program including instructions for:
 receiving physical layer signaling sent by a second network device, wherein the physical layer signaling indicates a first state or a second state, and wherein the physical layer signaling includes feedback time information; 
 obtaining channel state information; and 
 generating channel state indication information by:
 in response to the physical layer signaling indicating the first state, generating the channel state indication information comprising an absolute value of the channel state information; and 
 in response to the physical layer signaling indicating the first state, generating the channel state indication information comprising an offset value of the channel state information relative to reference channel state information, wherein the reference channel state information is notified by the second network device to the apparatus; 
 
 
 determine a transmission time based on the feedback time information; and 
 send, using the transceiver, the channel state indication information at the transmission time. 
 
     
     
       11. The apparatus according to  claim 10 , wherein the channel state information comprises:
 modulation and coding scheme (MCS) information. 
 
     
     
       12. The apparatus according to  claim 10 , wherein the channel state information comprises:
 block error rate (BLER) information. 
 
     
     
       13. The apparatus according to  claim 10 , wherein the channel state information comprises:
 power information.